Anthropic, the company behind Claude, filed its IPO prospectus (Form S-1) publicly with the SEC on 26 October 2026 and plans to list on the Nasdaq as ANT. It shows $16.3 billion in revenue for the first half of 2026, up from $1.2 billion a year earlier, and an $80.7 billion net loss that is mostly an accounting charge. For organisations that run on Claude, the risk section matters more: Anthropic says it has changed, and may change again, usage limits, rate limits and model capabilities.
A $72.4 billion charge on investor notes makes up most of the loss
The charge comes from convertible notes: loans from investors that turn into shares later. As Anthropic’s valuation climbed, those notes became more expensive on paper. The filing says the change was “primarily driven by an increase in the fair value of our outstanding convertible promissory notes”. No cash left the company for it.
The business underneath looks very different. Under standard accounting rules (GAAP), Anthropic’s operating margin in the first half of 2026 was minus 4%, against minus 184% a year earlier. On its own adjusted measure, which also leaves out stock-based pay, it made an operating profit of $1.6 billion. Adjusted figures are the company’s own choice of what to leave out, so read them next to the GAAP margin. On 30 June, Anthropic held $131.7 billion in cash and short-term investments.
Most of the money comes from businesses. More than 11,900 customers paid Anthropic $100,000 or more in the twelve months to 30 September, and about 250 paid more than $10 million. The filing also says a substantial part of revenue depends on “a limited number of customers and distribution channels”. The Next Web reports that the five largest customers brought in about a quarter of revenue in the first nine months of 2026.
Anthropic warns that Claude’s limits and models can change
The risk factors spell out what customers may notice. “We have also changed, and may in the future change, usage limits, rate limits, or model and product capabilities,” the filing says. It also warns that “the cost of compute could rise significantly”. The Next Web, which went through the filing, counts more than $430 billion in compute commitments with Google, Amazon, Microsoft and Broadcom. Anthropic left the total committed amount blank in this version of the S-1.
June showed how quickly access can change. A US Commerce Department export directive told Anthropic to stop foreign nationals from using Claude Fable 5 and Claude Mythos 5, and Anthropic switched both models off for all customers. The Next Web reports that the filing describes this restriction as lifted since. For organisations outside the US, this is the sovereignty debate in concrete form: a decision in Washington can remove a model that your process depends on.
Seven co-founders keep 50.1% of the votes after the listing
Buyers of the Class A shares will own part of Anthropic, but they will not control it. A company owned by the seven co-founders holds a Class F share with 50.1% of the votes on most shareholder matters. The Long-Term Benefit Trust holds a Class T share that lets it elect a majority of the board. Anthropic stays a public benefit corporation, a legal form that lets the board weigh a public mission next to profit.
For customers, this means the people who set Claude’s usage policies today stay in charge after the listing. Shareholders can push for margins through the share price, but they cannot vote in a new board.
Can you buy Anthropic shares outside the US?
Yes, in several countries: the S-1 says the offering includes public offerings in Australia, Canada, certain member states of the European Economic Area, Japan, Switzerland and the United Kingdom. The offering summary does not name the EEA countries, and the number of shares and the price range are still blank. The Wall Street Journal reported a target of the week of 16 November, while Fortune wrote that the debut is planned for Thanksgiving week. Both dates can still move.
Use the S-1’s own risk list as your Claude contract checklist
For the organisations DataNorth works with, the filing changes the vendor question around Claude. The risk that Anthropic runs out of money looks small for now, with a large cash position and a core business close to break-even. The risk that Claude changes under you is real, and Anthropic now states it in a legal document.
If you are about to sign a multi-year Claude Enterprise or API commitment, bring the filing’s wording to the negotiation. Ask for notice periods before model versions are retired, written rate limits for your volume and price protection for the contract term. Keep prompts and agent workflows portable, and test at least one alternative model on your most important process, for example an open-weight model on European infrastructure. A tested fallback turns a forced model change into a configuration change instead of a project.
For more information, visit the official announcement of the S-1 filing in the Anthropic newsroom.
